Geologic descriptionThis occurrence consists of copper staining and tiny veinlets of chalcocite in float of Nikolai Greenstone of Late Triassic age (Rose, 1966 [ADMM GR 19]). The basalt displays epidote alteration similar to basalt-hosted copper occurrences on Paxson Mountain (Rose and Saunders, 1965). The quartz veins are localized in north-northeast-trending joints that cut across the folded limbs of the Amphitheater syncline. The veins post-date late Jurassic deformation and are probably either Cretaceous related to regional metamorphism and granitic plutonism (Nokleberg and others, 1986) or early Tertiary (Stout, 1976). |
Geologic map unit |
(-145.912143773473, 63.1512778131322) |
Mineral deposit model |
Basaltic Cu (Cox and Singer, 1986; model 23). |
Mineral deposit model number |
23 |
Age of mineralization |
Late Triassic and Cretaceous. |
Alteration of deposit |
The basalt displays epidote alteration; copper minerals are oxidized (Rose, 1966 [ADMM GR 19]). |